Episode 2: The Case of the Missing DoughnutFirst shown: 19 September 1970 (US), 8 January 1971 (UK)Director: Harry BoothWriter: Peter MillerAppearing apart from the Double Deckers:Melvyn Hayes as Albert the Street CleanerJulian Orchard as the Toy Shop OwnerRoy Evans as the BakerJack Haig as Harvey the Toy Shop Assistant

Plot

Brains is working on a new experimental gloop. Doughnut, who has just been chucked out of the neighbourhood toyshop and the bakery, eats it and becomes invisible. He takes his revenge on the toy shop owner and assistant, and the baker, but the gang trick him by pretending that he is still invisible after it wears off and watching in glee as he returns to the toyshop one last time. And then he wakes up; for it was all a dream.

Glorious moments

Let's face it, this is probably the single episode of Here Come The Double Deckerswhich has weathered the test of time least well. Still, Bruce Clark as Sticks gets a very good shock-horror reaction to Doughnut's apparent invisibility; the special effects of the invisble boy are good; and the second scene in the bakery is almost the definition of slapstick.

Also another great Brains/Tiger exchange:

Brains: Skepticism didn't get the Americans to the moon, now did it?Tiger: No. It was a rocket!

Less glorious moments

Er, most of it.

What's all this then?

The story of a person who becomes invisible and uses that power for evil goes all the way back to Plato's fable of the Ring of Gyges, in which he argues that the man who uses the ring to become invisible will use that power to satisfy his appetites because he does not have to worry about the consequences. OK, seducing the queen, killing the king and usurping the throne isn't quite the same as disrupting a toy shop and a bakery, but you see what I'm getting at. I will admit that a more likely influence was the 1957 film The Invisible Boy, in which the eponymous boy uses his power to play tricks such as interrupting his parents embracing in their bedroom. (Not to mention H.G. Wells, or the 1959-59 ITV series starring Deborah Watling as the invisible man's niece.)

There's also a little more (though only a little more) to Doughnut's role as the show's clown than meets the eye. Clowns are often linked to magic, as were medieval jesters before them, and so if you are going to make one character invisible, it may as well be the clown. A Clown is also a Fool, and the Fool's role is often wish fulfilment for the audience, who may well want to have a free run of local toy shops and bakeries, or more generally to defy authority without consequence.

Where's that?

All filmed in studio.

Who's that?

Douglas Simmonds, who played Doughnut, did one other TV appearance in 1971 and then became a real scientist, working in medicine, physics and computing. He died suddenly in 2011, aged only 52.

Julian Orchard (the Toy Shop Owner) was one of the typical rep actors doing vaguely posh or stuck-up comedy parts. At the time this was made, he was regularly appearing as sidekick to Harry Secombe in The Harry Secombe Show, Jimmy Edwards in Whack-O!, and Spike Milligan in The World of Beachcomber. He died in 1979, aged only 49.

Roy Evans (the Baker) was another actor who turned up in the background of everything - he was in Doctor Who three times, most notably as Trantis in The Daleks' Master Plan (1965-66) but also as Bert in The Green Death (1973) and another unnamed miner in The Beast of Peladon (1974). He was born in 1930 and appears to have last worked in 2004, which is fair enough.

Jack Haig (Harvey the Toyshop Assistant) was already in his late 50s, and had done many comedy support roles for many years without quite hitting the big time. His heyday was yet to come: from 1982 until shortly before his death aged 76 in 1989, he played Roger LeClerc in 'Allo! 'Allo!, memorable for his catchphrase, "It is I, LeClerc!"

Peter Miller wrote four Double Deckers episodes; the other three are all better than this. His biggest hit before this was a sitcom about a vicar called Our Man at St Marks, which ran for four seasons in 1963-66, starring first Leslie Phillips and then Donald Sinden along with Joan Hickman; he wrote all 46 episodes. After Double Deckers he became a producer on the revisionist 1972-73 series Arthur of the Britons, and both produced and wrote a short-lived 1980 sitcom called The Square Leopard. His credits peter out in the mid-1980s.